Low FPS Blender(viewport)
Here's a trick that will let you see a faster frame rate while sacrificing a few frames here and there while cycling through the animation: Use frame dropping playback. What this does is remove a few frames here and there while playing the animation so that the playback speed looks normal. Don't worry! This does not affect the playback of the  final render. Here's a picture:
FYI this is 2.79. If you use 2.8+, the playback type is next to it.